expects a callback instead of returning a promise

By design Issue #9420301


Wladimir P.
Oct 19, 2016
This issue is public.
Found in
  • Microsoft Edge
Found in build #
Reported by 6 people

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Steps to reproduce

In an extension, use the following code:"foo").then(result => console.log(result));

This throws an exception:

Invocation of form storage.local.get(string) doesn’t match definition storage.local.get(optional string or array or object keys, function callback).

This API is supposed to be supported and links to There it says: “This API is also available as<storageType>.get() in a version that returns a promise.” So it is supposed to return a promise, just like all the other APIs - yet currently it expects a callback, just like


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    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “Ibrahim O.”

      Changed Assigned To from “Ibrahim O.” to “Chee C.”

      Changed Status to “Confirmed”

      Changed Assigned To from “Chee C.” to “Brad E.”

      Changed Assigned To from “Brad E.” to “Chee C.”

    • Also in version 14986.1000.

    • Microsoft Edge Team

      Changed Status from “Confirmed” to “By design”

    • Hello,

      Thank you for providing this information about the issue. A Microsoft Edge Extension does not support the Promise model; this is a documented difference between Mozilla and Edge’s platform. Currently, we do not plan to release a fix. Please update this case if you can provide new information for us to consider.

      Best Wishes,
      The MS Edge Team

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